Structure of a fan

ABSTRACT

The present invention relates to an improved structure of a fan, which is a centrifugal fan composed of a round housing and a blade set, where each blade is spaced in equidistance and spliced in a round housing. Each blade forms a triangular conical face on one side and a flat face on the other face. While a fan is running, a blade so designed functions to guide air flow and reduce turbulence to the minimum.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an improvement of a blade structure of a fan in an attempt to eliminate the turbulence more than often taking place in the centrifugal fan, guide the air current and lessen the air resistance on a blade and lift the working performance of a fan.

[0002] In general, a fan is operated in two modes, the axial mode and the centrifugal mode. As for the axial mode fan, the air current from the intake to the outlet is in the same direction and the air flows in and out along the fan axis. That is to say, the air current goes along the fan axis. As for the centrifugal mode fan, the air current is blown out along the periphery of the fan, just perpendicular to the intake air current. While the fan in running, due to the centrifugal effect, the air current is sucked from the central openings and propelled by the blade along the side wall.

[0003] However, the prior art of the centrifugal fan 10 a (referred to FIGS. 1 through 3) comprises a round housing 11 a and a blade assembly 12 a arranged on the periphery of the round housing 11 a. Each blade of a blade assembly 12 a is spaced at equidistance and locked in the round housing 11 a. Each blade is curved, so the whole blade assembly 12 a is in the vortex form. Each blade is a long flat strap with two flat faces on each side. While the electric fan 10 a is running, the air current generated from the blade assembly 12 a flowing along each blade will form a whirl (as shown in FIG. 3), which diverges the regular air direction, creates air resistance, affects the rotation of the electric fan 10 a and impairs the performance.

[0004] Viewing from the aforesaid statement, the turbulence generated in the prior art of a fan is a substantial defect which has to be corrected.

[0005] The inventor has dedicated great effort to the improvement of such a defect noted, and with a theoretical application, come up with an improved blade structure of a fan provided in the invention.

SUMMARY OF THE INVENTION

[0006] The main object of the present invention is to provide an improved blade structure of a fan to remove completely the turbulence often produced in the centrifugal fan. The improved blade further guides the air current to flow out smoothly, so the performance of the electric fan is therefore much bettered.

[0007] To achieve the aforesaid object, the invention provides an improved fan structure composed of a round housing with a blade set having a plurality of blades fixed on the periphery. Each of the blades is equidistantly spaced and spliced in the round housing. Each of the blades is formed with a triangular conical face on one side and a flat face on other face. The air intake will flow first along the triangular conical face, then toward the flat face and finally out of the fan in a smooth air dynamic line.

[0008] The drawings attached disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages and objects hereof but place no restraint on the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1 is a stereo of the prior art of the centrifugal electric fan.

[0010]FIG. 2 is a top view of the prior art of the centrifugal electric fan.

[0011]FIG. 3 is a schematic diagram showing the air movement of prior art of the centrifugal electric fan.

[0012]FIG. 4 is a stereo of the centrifugal electric fan of the invention.

[0013]FIG. 5 is a top view of the centrifugal electric fan of the invention.

[0014]FIG. 6 is a schematic diagram showing the air movement of the centrifugal electric fan of the invention.

[0015]FIG. 7 is a stereo showing the electric fan of the invention is running.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Please refer to FIGS. 4 and 5, an improved structure of a fan provided in the invention is a centrifugal fan 1, comprising a round housing 11, a blade set 12 having a plurality of blades arranged on the periphery of the round housing 11. Each blade of the blade set 12 is equidistantly spaced and bent in curve form. The whole blade set 12 is constructed in a vortex shape. Each blade is formed with one triangular conical face 121 on one side and a flat face 122 on the other side. Each blade having a terminal end is formed a bevel face tangential to the concentric circle of the round housing 11 and forms a smooth glide line with the flat face 122. Alternatively, each blade end can be made either a vertical cut face or a round curved face.

[0017] While the electric fan 1 is running, supposing the flat face 122 of the blade is receiving the air current as shown in FIG. 6, on the back of the front blade face 2 is a triangular conical face 121′. The air current which is sucked in will whirl along the front blade face 2 and triangular conical face 121′, then converges along the central line toward the rear blade face 3 of the flat face 122″, and eventually flows out of the fan along the flat face 122″. Similarly, the front blade face 2 of the flat face 122′ is able to guide out the air current sucked in moving toward and along the triangular conical face 121″ of the rear blade face 3. The guided air current forms a streamlined dynamic line so as to lessen the air resistance and accelerate the air movement.

[0018] As shown in FIG. 7, the fan 1 is locked in a fan box 4. The fan box 4 has openings on the top cover, which guide the air into the fan 1. When the fan 1 is in operation, the air current is sucked in through the top openings of the fan box 4 and blown out through a side wall to attain ventilation and heat dissipation. The fan 1 effects the turbulence reduction. The guided air current design improves both turbulence and noise.

[0019] In an improved blade structure of a fan provided in the invention, each blade has a triangular conical face on the back side, which guides the sucked air current effectively to remove the turbulence, to reduce the air resistance and to enhance performance of a fan. The flat face of the blade will streamline the air current out of the fan box to gain faster and more efficient air movement.

[0020] The invention has substantially improved the turbulence and air resistance, which are frequently inevitable in the centrifugal electric fan. It is a novel and advanced product, satisfying the patent requirements and justified for a favorable grant of patent certificate to protect the inventor's right and interest.

[0021] Many changes and modifications in the above disclosed embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims. 

What is claimed is:
 1. An improved structure of a fan, comprising a round housing; and a blade set having a plurality of blades, each of the blades is equidistantly spaced and spliced in a round housing, the blades respectively formed with a triangular conical face on one side and a flat face on the other side.
 2. The improved structure of a fan of claim 1, wherein each of the blades is bent in curve.
 3. The improved structure of a fan of claim 1, wherein each of the blades having a terminal end formed a bevel face. 